[libgda: 1/2] Fix out-of-source build when gtk-doc is enabled

[Rodrigo Moya <rodrigo src gnome org>]

commit a7a39242e4c6882e723130c00a1803b4fb4171c1
Author: Ting-Wei Lan <lantw src gnome org>
Date:   Sun Dec 24 17:08:25 2017 +0800

    Fix out-of-source build when gtk-doc is enabled
    
    Bug #791914

 doc/C/Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/doc/C/Makefile.am b/doc/C/Makefile.am
index 37d1e2c15..bf5204a46 100644
--- a/doc/C/Makefile.am
+++ b/doc/C/Makefile.am
@@ -15,7 +15,7 @@ SCAN_OPTIONS=--deprecated-guards="GDA_DISABLE_DEPRECATED"
 SCANGOBJ_OPTIONS=
 
 # The directory containing the source code. Relative to $(srcdir)
-DOC_SOURCE_DIR=../src-files
+DOC_SOURCE_DIR=$(top_srcdir)/doc/src-files
 
 # Add the builddir to the HTML path so that version.xml is found
 MKHTML_OPTIONS=--path="$(abs_srcdir)"